C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS83 KLOT 301059
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
559 AM CDT Tue Sep 30 2025
McHenry-Lake IL-
Including the cities of Crystal Lake, Algonquin, McHenry,
Woodstock, Waukegan, Buffalo Grove, Mundelein, and Gurnee
559 AM CDT Tue Sep 30 2025
...Locally Dense Fog Early This Morning...
Pockets of fog will locally reduce visibilities under one half
mile early this morning. If you are traveling, be prepared for
rapid changes in visibility over short distances, and use low-beam
headlights. The fog will dissipate by 8 to 9 AM.
https://wxn.io/tgy1o
John Jensen K9WXX of McHenry County Weather is an avid and passionate weather geek who post watches, warnings and advisories on our blog and Facebook
Established: 2013
Coverage Area:
McHenry County, IL
Tuesday, September 30, 2025
Monday, September 22, 2025
Special Weather Statement for McHenry Co., IL
C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS83 KLOT 220957
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
457 AM CDT Mon Sep 22 2025
Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, Rochelle, Oregon, Byron, Dixon,
DeKalb, and Sycamore
457 AM CDT Mon Sep 22 2025
...Locally Dense Fog Early This Morning...
Pockets of fog will locally reduce visibilities under one half
mile early this morning. If you are traveling, be prepared for
rapid changes in visibility over short distances, and use low-beam
headlights. The fog will dissipate by the mid morning.
https://wxn.io/skcyk
WWUS83 KLOT 220957
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
457 AM CDT Mon Sep 22 2025
Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, Rochelle, Oregon, Byron, Dixon,
DeKalb, and Sycamore
457 AM CDT Mon Sep 22 2025
...Locally Dense Fog Early This Morning...
Pockets of fog will locally reduce visibilities under one half
mile early this morning. If you are traveling, be prepared for
rapid changes in visibility over short distances, and use low-beam
headlights. The fog will dissipate by the mid morning.
https://wxn.io/skcyk
Saturday, September 20, 2025
Special Weather Statement for McHenry Co., IL
C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS83 KLOT 202118
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville
418 PM CDT Sat Sep 20 2025
McHenry IL-
418 PM CDT Sat Sep 20 2025
...A GUSTY THUNDERSTORM WILL IMPACT MCHENRY COUNTY THROUGH 515 PM
CDT...
At 417 PM CDT, Doppler radar was tracking a gusty thunderstorm near
Marengo, moving northeast at 30 mph.
HAZARD...Wind gusts of 40 to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Oakwood Hills, Spring Grove, McCullom Lake, Algonquin, Union,
Woodstock, Harvard, Hebron, Holiday Hills, McHenry, Ridgefield,
Lakemoor, Cary, Johnsburg, Ringwood, Pistakee Highlands, Huntley,
Island Lake, Greenwood, Wonder Lake, Lakewood, Prairie Grove,
Marengo, Trout Valley, and Lake in the Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle
&&
LAT...LON 4225 8820 4215 8824 4215 8871 4221 8871
4250 8858 4249 8820
TIME...MOT...LOC 2117Z 207DEG 25KT 4217 8858
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
https://wxn.io/9635y
WWUS83 KLOT 202118
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville
418 PM CDT Sat Sep 20 2025
McHenry IL-
418 PM CDT Sat Sep 20 2025
...A GUSTY THUNDERSTORM WILL IMPACT MCHENRY COUNTY THROUGH 515 PM
CDT...
At 417 PM CDT, Doppler radar was tracking a gusty thunderstorm near
Marengo, moving northeast at 30 mph.
HAZARD...Wind gusts of 40 to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Oakwood Hills, Spring Grove, McCullom Lake, Algonquin, Union,
Woodstock, Harvard, Hebron, Holiday Hills, McHenry, Ridgefield,
Lakemoor, Cary, Johnsburg, Ringwood, Pistakee Highlands, Huntley,
Island Lake, Greenwood, Wonder Lake, Lakewood, Prairie Grove,
Marengo, Trout Valley, and Lake in the Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle
&&
LAT...LON 4225 8820 4215 8824 4215 8871 4221 8871
4250 8858 4249 8820
TIME...MOT...LOC 2117Z 207DEG 25KT 4217 8858
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
https://wxn.io/9635y
Tuesday, September 16, 2025
Special Weather Statement for McHenry Co., IL
C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS83 KLOT 161051
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
551 AM CDT Tue Sep 16 2025
Boone-McHenry-Lake IL-De Kalb-Kane-
Including the cities of Belvidere, Crystal Lake, Algonquin,
McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee,
DeKalb, Sycamore, Aurora, and Elgin
551 AM CDT Tue Sep 16 2025
...Patchy Fog this Morning...
Patchy fog has developed early this morning across portions of
interior northern Illinois outside of Chicago, some of which has
become locally dense with visibilities of one quarter mile or
less. Be prepared for sudden changes in visibility over short
distances during the morning commute. Slow down, increase
following distance, and use low beams when driving in fog.
https://wxn.io/n9bev
WWUS83 KLOT 161051
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
551 AM CDT Tue Sep 16 2025
Boone-McHenry-Lake IL-De Kalb-Kane-
Including the cities of Belvidere, Crystal Lake, Algonquin,
McHenry, Woodstock, Waukegan, Buffalo Grove, Mundelein, Gurnee,
DeKalb, Sycamore, Aurora, and Elgin
551 AM CDT Tue Sep 16 2025
...Patchy Fog this Morning...
Patchy fog has developed early this morning across portions of
interior northern Illinois outside of Chicago, some of which has
become locally dense with visibilities of one quarter mile or
less. Be prepared for sudden changes in visibility over short
distances during the morning commute. Slow down, increase
following distance, and use low beams when driving in fog.
https://wxn.io/n9bev
Sunday, September 14, 2025
Dense Fog Advisory Expiration for McHenry Co., IL
C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS73 KLOT 141353
NPWLOT
URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
853 AM CDT Sun Sep 14 2025
/O.EXP.KLOT.FG.Y.0010.000000T0000Z-250914T1400Z/
Winnebago-Boone-McHenry-De Kalb-Kane-
Including the cities of Sycamore, McHenry, Belvidere, Aurora,
Crystal Lake, Woodstock, Rockford, DeKalb, Algonquin, and Elgin
853 AM CDT Sun Sep 14 2025
...DENSE FOG ADVISORY WILL EXPIRE AT 9 AM CDT THIS MORNING...
Dense fog around the area is dissipating allowing the advisory to
expire at 9 AM CDT. Localized patchy fog with reduced visibility
down to a mile may linger in spots for another hour or two.
https://wxn.io/rd8kh
WWUS73 KLOT 141353
NPWLOT
URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
853 AM CDT Sun Sep 14 2025
/O.EXP.KLOT.FG.Y.0010.000000T0000Z-250914T1400Z/
Winnebago-Boone-McHenry-De Kalb-Kane-
Including the cities of Sycamore, McHenry, Belvidere, Aurora,
Crystal Lake, Woodstock, Rockford, DeKalb, Algonquin, and Elgin
853 AM CDT Sun Sep 14 2025
...DENSE FOG ADVISORY WILL EXPIRE AT 9 AM CDT THIS MORNING...
Dense fog around the area is dissipating allowing the advisory to
expire at 9 AM CDT. Localized patchy fog with reduced visibility
down to a mile may linger in spots for another hour or two.
https://wxn.io/rd8kh
Dense Fog Advisory for McHenry Co., IL until 9:00 AM CDT 9/14
C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS73 KLOT 141003
NPWLOT
URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
503 AM CDT Sun Sep 14 2025
/O.NEW.KLOT.FG.Y.0010.250914T1003Z-250914T1400Z/
Winnebago-Boone-McHenry-De Kalb-Kane-
Including the cities of DeKalb, Woodstock, Elgin, Rockford,
Belvidere, McHenry, Crystal Lake, Aurora, Sycamore, and Algonquin
503 AM CDT Sun Sep 14 2025
...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CDT THIS MORNING...
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Boone, De Kalb, Winnebago, Kane, and McHenry Counties.
* WHEN...Until 9 AM CDT this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Dense fog expected mainly in rural areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.
&&
https://wxn.io/r2s5w
WWUS73 KLOT 141003
NPWLOT
URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
503 AM CDT Sun Sep 14 2025
/O.NEW.KLOT.FG.Y.0010.250914T1003Z-250914T1400Z/
Winnebago-Boone-McHenry-De Kalb-Kane-
Including the cities of DeKalb, Woodstock, Elgin, Rockford,
Belvidere, McHenry, Crystal Lake, Aurora, Sycamore, and Algonquin
503 AM CDT Sun Sep 14 2025
...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CDT THIS MORNING...
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Boone, De Kalb, Winnebago, Kane, and McHenry Counties.
* WHEN...Until 9 AM CDT this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Dense fog expected mainly in rural areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.
&&
https://wxn.io/r2s5w
Friday, September 12, 2025
Special Weather Statement for McHenry Co., IL
C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS83 KLOT 120919
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
419 AM CDT Fri Sep 12 2025
Winnebago-Boone-McHenry-De Kalb-Kane-Northern Cook-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, DeKalb, Sycamore, Aurora, Elgin,
Evanston, Des Plaines, Schaumburg, Palatine, and Northbrook
419 AM CDT Fri Sep 12 2025
...AREAS OF FOG THIS MORNING...
Areas of fog are being observed across portions of northern
Illinois this morning resulting in visibilities as low as 1 mile.
Locally dense fog is occurring in Lake County, Illinois where a
Dense Fog Advisory is in effect until 10 AM this morning. Allow
extra time for the morning commute and use low beams when driving
in fog.
https://wxn.io/7r41m
WWUS83 KLOT 120919
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
419 AM CDT Fri Sep 12 2025
Winnebago-Boone-McHenry-De Kalb-Kane-Northern Cook-
Including the cities of Rockford, Belvidere, Crystal Lake,
Algonquin, McHenry, Woodstock, DeKalb, Sycamore, Aurora, Elgin,
Evanston, Des Plaines, Schaumburg, Palatine, and Northbrook
419 AM CDT Fri Sep 12 2025
...AREAS OF FOG THIS MORNING...
Areas of fog are being observed across portions of northern
Illinois this morning resulting in visibilities as low as 1 mile.
Locally dense fog is occurring in Lake County, Illinois where a
Dense Fog Advisory is in effect until 10 AM this morning. Allow
extra time for the morning commute and use low beams when driving
in fog.
https://wxn.io/7r41m
Thursday, September 11, 2025
Special Weather Statement for McHenry Co., IL
C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX
WWUS83 KLOT 110934
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
434 AM CDT Thu Sep 11 2025
McHenry-Lake IL-
Including the cities of Crystal Lake, Algonquin, McHenry,
Woodstock, Waukegan, Buffalo Grove, Mundelein, and Gurnee
434 AM CDT Thu Sep 11 2025
...Patchy Dense Fog Possible Early This Morning...
Areas of fog are developing into far northeast Illinois early this
morning from Wisconsin. Patchy dense fog, with visibilities less
than a half mile, will persist through sunrise across portions of
Lake and McHenry counties, especially north of Route 120. Fog
should gradually lift after sunrise, with improving visibilities.
If heading out early this morning, be alert for rapid changes in
visibility. If you encounter dense fog, slow down, use your low
beam headlights and exercise caution.
https://wxn.io/ao8z4
WWUS83 KLOT 110934
SPSLOT
Special Weather Statement
National Weather Service Chicago/Romeoville IL
434 AM CDT Thu Sep 11 2025
McHenry-Lake IL-
Including the cities of Crystal Lake, Algonquin, McHenry,
Woodstock, Waukegan, Buffalo Grove, Mundelein, and Gurnee
434 AM CDT Thu Sep 11 2025
...Patchy Dense Fog Possible Early This Morning...
Areas of fog are developing into far northeast Illinois early this
morning from Wisconsin. Patchy dense fog, with visibilities less
than a half mile, will persist through sunrise across portions of
Lake and McHenry counties, especially north of Route 120. Fog
should gradually lift after sunrise, with improving visibilities.
If heading out early this morning, be alert for rapid changes in
visibility. If you encounter dense fog, slow down, use your low
beam headlights and exercise caution.
https://wxn.io/ao8z4
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